Abstract:
A vapor pressure regulation system includes a vessel including a vessel wall that defines an enclosure, and a temperature adjustment mechanism coupled to the vessel. A heat transfer between the temperature adjustment mechanism and the vessel is adjusted based on at least a vapor pressure within the vessel to facilitate regulating the vapor pressure within the vessel.
Abstract:
A method and system delivers a cryogenically stored fuel in a gaseous state into the air intake system of a gaseous fuelled internal combustion engine. The method involves measuring the pressure in the vapor space of the cryogenic storage vessel, comparing the measured pressure to a required fuel supply pressure and supplying fuel in gaseous state directly from the vapor space of the cryogenic storage vessel to the fuel delivery line that supplies fuel to the engine, when the pressure measured in the vapor space of the cryogenic storage vessel is equal to or higher than the required fuel supply pressure. The method further involves activating a cryogenic pump to deliver fuel to the internal combustion engine from the liquid space of the cryogenic storage vessel when the measured pressure in the vapor space is lower than the required fuel supply pressure.
Abstract:
A cryogenic discharge muffler wherein the operation thereof depends on a small amount of cryogenic liquid being retained in a sump portion of the muffler assembly. The liquid boils away during off-cycles and prevents ice buildup on the muffler. The muffler is intended to disperse cryogenic liquid so that the liquid will evaporate on contact with air and thereby reduce or substantially minimize the hazard generally associated with the discharge of cryogenic liquids.
Abstract:
A method for providing cold energy to one or more industrial or commercial facilities from a liquid carbon dioxide receiving facility is provided. The method includes the steps of unloading liquid carbon dioxide to the receiving facility, storing liquid carbon dioxide in temporary storage, generating boil-off gas from the temporary storage due to heat ingress, pumping and heating liquid carbon dioxide for external use or permanent geologic storage, and utilizing at least some, and preferably substantially all, of the cold energy from the liquid carbon dioxide for cooling one or more processes in the one or more industrial or commercial facilities.
Abstract:
A ship comprises an engine; a first self-heat exchanger which heat-exchanges boil-off gas discharged from a storage tank; a multi-stage compressor which compresses, in multi-stages, the boil-off gas that passed through the first self-heat exchanger after being discharged from the storage tank; a first decompressing device which expands one portion of the boil-off gas compressed by the multi-stage compressor; a second self-heat exchanger which heat-exchanges the other portion of the boil-off gas compressed by the multi-stage compressor, with the boil-off gas expanded by the first decompressing device; and a second decompressing device which expands the boil-off gas pre-cooled by the second self-heat exchanger and cooled by the first self-heat exchanger, wherein the first self-heat exchanger uses the boil-off gas discharged from the storage tank as a refrigerant for cooling the boil-off gas that passed through the second self-heat exchanger after being compressed by the multi-stage compressor.
Abstract:
A method for operating a hydrogen fueling station is described, wherein the latter exhibits at least at least one storage tank, which is used to store liquefied hydrogen, and in which boil-off gas at least occasionally accumulates, at least one cryogenic pump, which is used to compress the hydrogen to the desired dispensing pressure, at least one dispenser, through which the compressed hydrogen is dispensed, and lines that connect the aforementioned components. According to the invention, the boil-off gas that accumulates is at least partially used for cooling at least one component and/or line of the hydrogen fueling station and/or is at least partially catalytically combusted.
Abstract:
A pressure control system comprises separate conduits for supplying liquefied gas and vapor from a cryogen space defined by a cryogenic storage tank. A first conduit can deliver liquefied gas to a use device through a heater and then a first flow controller. A second conduit can deliver vapor to the use device with flow therethrough controlled by a second flow controller. The first flow controller is not exposed to liquefied gas at cryogenic temperatures because it is located downstream from the heater. For automatic operation a pressure sensor measures pressure inside the cryogen space and the first and second flow controllers are independently operable to maintain the pressure inside the cryogen space within a predetermined range. In a preferred embodiment the liquefied gas is a combustible fuel that is consumed by an internal combustion engine, which is the use device.
Abstract:
The invention relates to a method for compression of boil-off gas produced in the storage of liquefied natural gas (LNG), in which the boil-off gas is compressed in a single-stage or multistage manner and then fed to a further use. The boil-off gas (1) that is to be compressed undergoes a pressure elevation by means of at least one ejector (Y) and then warmed (E2), before being compressed (V) in a single-stage or multistage manner> The motive gas (2) used for the ejector (Y) is a substream of the compressed boil-off gas and/or a gas, the composition of which is substantially identical to or similar to that of the boil-off gas (1) and/or the addition of which to the boil-off gas does not adversely affect the intended use of the compressed boil-off gas.
Abstract:
A boil-off gas (BOG) stream (15) from a liquefied hydrocarbon storage tank is split into a BOG heat exchanger feed stream (25) and a BOG bypass stream (35). The BOG heat exchanger feed stream (25) is heat exchanged in a BOG heat exchanger (40) against a process stream (135), thereby providing a warmed BOG stream (45) and a cooled process stream (195). The warmed BOG stream (45) is combined with the BOG bypass stream (35) to provide a temperature controlled BOG stream (55). Herein, the mass flow of the process stream (135) is controlled in response to a measured first temperature of at least one of (i) the warmed BOG stream (45) and (ii) the cooled process stream (195) to move the measured first temperature towards a first set point temperature; and the mass flow of one or both of the BOG heat exchanger feed stream (25) and the BOG bypass stream (35) are controlled in response to a measured second temperature of the temperature controlled BOG stream (55), to move the measured second temperature towards a second set point temperature.